Once Key realised he could do what he liked, he pressed Goff on the revenue gap - at least $14 billion - to meet Labour's spending promises.
When Goff couldn't come up with a good enough answer, Key pressed him again and again.
Key, a former currency trader, was very cocky. He bragged about how good he was with money and demanded to know where Labour would get the funds for its policies: "Show me the money ... It ain't there, son".
Goff, who had put in a much better performance than Key until the costing gap came up, visibly wilted under the pressure.
He had no answer besides saying Labour would issue a spreadsheet before the election and that there would be a bit more borrowing.
So Labour's answer to New Zealand's debt crisis is to more borrowing, Key crowed.
Key grabbed the opportunity given to him last night to reset the agenda.